Improvement in locomotive attachments



NV PETERS. PHOTD-L1THOGRAFHER. WASHINGTON. D. C.

ein can.

CLARK LEWIS, 0F CA Letters Pa tent No. 107,511,

SSVILLE, NEW YORK.

dated September 20, 1870. v

IMPROVEMENT IN LOCOMOTIVE ATTACHMENTS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom Iit may concern:

Be it known that I, CLARK LEWIS, of C assville, in the county of Oneida and State of New York, have invented a new and improved Locomotive Attachment; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing forming a part of this specification.

My invention relates to steam-valves and val gear for locomotive-engines; and

The object is to hold back, break up, or entirely stop a train of cars by steam.

It consists in certain improvements, which will rst be described in connection with all that is necessary to a full understanding thereof, and then be clearly specified in the summary or claim.

' Figures l and 2 represent, respectively, opposite side views of a locomotive, with my valves and operative mechanism attached.

Figures 3, 4, 5, and (i, are detail sectional views of the valves. Y

Figures 7 and 8 are, modifications of a particular device hereinafter described.

A is the steam-cylinder;

C, the common slide-valve; and

B,- thc intermediate slide or attachment-valve.

Figs. 3 and 4 show these valves in section, supportedv upon one another and the cylinder, and also their relative positionsafter the forward aud backward throw of the piston.

Fig. 5 shows attachment-valves, with inlets closed.

Fig. 6 shows the valves as applied to the face of the steam-cylinder, while dotted lines indicate steamchest.

a represents the induction, and b the exhaust-ports of the cylinder, while a' are corresponding passages in the attachment-valve.

In fig. 6 this valve drawnl back to its utmost backward throw, when it will beperceived that it registers with the ports of the cylinder, and leaves both inlet and exhaust-passages open.

0n the other hand,when, as in iig. 5, the furthest forward throw is given to this valve, it will not register with the cylinder, but will cut off the steam ent-irely, while the slide-valve (l may continue to reciprocate.`

D E represent jointed valve-rods.

I) is pivoted to a strap, D', whose other end is pivotcd to a vibrating lever, E2.

E is pivoted to an arm, El, which is also pivoted to the other end of lever E2.

Lever E2 is fast upon the rocking shaft O, which has au arm, I, vibrated by the ro d and hand-lever Q* Q".

. I l-, Y

The object of this mechanism is to raise andlower the ends of valve-rods, I) E, to regulate the throw of the-valves.

For this purpose the end of `rod D slides in the slotted arm F, and the rod E in the slotted yokearm N.

lhese arms give reciprocating-motion to the valves, and are respectively fast upon the rock-shafts O 0".

The hand device Q* Q5 also serves, by means of angle-lever Q, to raise lever It, and thereby act upon the throttle-valve.

Thus it will be perceived that, by a single movement, the engineer can act upon bot-h the slide-valves and throttle-valve. y

The shaft O2, which carries the top slide-valve, is operated by one arm of lever H, the link I, rods K K, and cams L L, on the di'iving4shaft. l

The link I is adjustable by means of slot therein, strap J arm I1 I, rod I, and hand-level' P.

The attachment valve-shaft O is operated by means of arm N, slotted link M, and short arm of lever H.

rlhe slotted link M, after each movement of the arm N, moves a space, the length of the slot, while the shaft is at rest. The purpose of this is to allow the attachment-valve B to standstill a certain length ot' time after each forward and backward movement.

Figs. 7 and 8 show moditicat-ions operated directly from the driving-shaft or crank-rod of the engine, which would obviously answer the same purpose as link M and its operative parts.

N, in iig. 7, is a rod jointed to pendent arm N'. n

X may be a reciprocating crank-rod, pivoted, at the end'of rod N, to an arc-slottcd piece, Y, which forms apart, or is rigidly attached to, and reciprocates, the rod E ot' the attachment-valve.

X carries Y, on the forward movement, to thc eudof its throw, and thereby deposits the attachmentvalve at its furthest point of travel; but when X returns, Y is left stationary, and is not carried back until the length ot' the slot has been traversed by X. rlhis givcs the desired `pause ofthe valve in the same mannerat each end.

In tig. 8 the arm N is not jointed, but continuous, and the rocking of the shaft is made to reciprocate the rod E, connected therewith, in any suitable manner.

N is provided with a double spring-pawl, n n, which is made to actuate the shaft by means of two notches, m in, on the reciprocating rod X. I

i X carries the arm to the limit of its throw, leaves it, travels back till notch m comes in contact with pawl n, and then takes it on the retui'n movement. Thus the proper panse is given to` the valve at each ultimate point of its travel. i

Q is a weighted adjustable rod, which slides on the lover Q to regulate the tlnottle-valve.

'lhe Inode of operation is as follows:

\Vhen the train is in motion the slide and attachment-valves move in opposite directions, and the steam is exhausted by bringing the inlet-ports of the cylin der into communication with the exhaust-port, the attachment-valve making a momentary stop at each end. This is seen in figs. 3 and 4 of drawing.

When, however, it is desired to stop the train entirely, or to retard its speed, the attachment-valve B is interposed so as to cut ofi' steam from the cylinder altogether, or to admit it behind the piston, to exert a counter pressure.

.Having thus described all that is necessary to an understanding of my invention,

What I esteem as new, and- Letters Patent, is y 1. The attachment-valve B, interposed between lesire to proteetfby the top slide-valve Gand the face of the cylinder A, as and for the purpose' described.

2. The slotted link M, or its equivalent, arranged in the machine, as and for the purpose described.

3. The rock-shaft O1, arranged andoperated by anyr suitablemechanism, combined with the lever E, straps D E', and slotted arms F N', to adj ust simultaneously the throw of the two valve-rods.

4. The combination of a hand-lever and rod Q* Q5, with the mechanism for adjusting 'the throw ot' the valves, and the mechanism for acting upon the throttle-valve, whereby the slide, attachment, and throttlevalves may be all simultaneously operated in the manner described. CLARK LEWIS.

Witnesses H. H. BARNUM, C. D. POTTER. 

